c# .XSPF (XML) how to get node depth

i have a .xspf playlist that i parse but the playlist has folders inside folders so when i display my parsed data
it doesnt have the same "depth". what would be the best way to achieve this.
Here is the .xspf
the folders are <vlc:node title="FOLDER"> 

<?xml version="1.0" encoding="UTF-8"?><playlist xmlns="http://xspf.org/ns/0/" xmlns:vlc="http://www.videolan.org/vlc/playlist/ns/0/" version="1"><title>Playlist</title><trackList><track><location>file:///E:/Downloads/JD/New%20Folder%20%282%29/Uuskaial.mp4</location><duration>1267008</duration><extension application="http://www.videolan.org/vlc/playlist/0"><vlc:id>0</vlc:id></extension></track><track><location>file:///E:/Downloads/JD/New%20Folder%20%282%29/Uusi%20kansio/111acho.mp4</location><duration>1904013</duration><extension application="http://www.videolan.org/vlc/playlist/0"><vlc:id>1</vlc:id></extension></track><track><location>file:///E:/Downloads/JD/New%20Folder%20%282%29/Uuansio.mp4</location><duration>538800</duration><extension application="http://www.videolan.org/vlc/playlist/0"><vlc:id>2</vlc:id></extension></track>

		.....
		 .....
		  .....
		   .....

	</trackList><extension application="http://www.videolan.org/vlc/playlist/0"><vlc:node title="444"><vlc:item tid="157"/><vlc:item tid="158"/><vlc:item tid="159"/><vlc:item tid="160"/><vlc:item tid="161"/><vlc:item tid="162"/><vlc:item tid="163"/><vlc:item tid="164"/><vlc:item tid="165"/><vlc:item tid="166"/><vlc:item tid="167"/><vlc:item tid="168"/><vlc:item tid="169"/><vlc:item tid="170"/><vlc:item tid="171"/><vlc:item tid="172"/><vlc:item tid="173"/><vlc:item tid="174"/><vlc:item tid="175"/></vlc:node><vlc:node title="333"><vlc:node title="em"><vlc:item tid="215"/><vlc:item tid="216"/><vlc:item tid="217"/><vlc:item tid="218"/><vlc:item tid="219"/><vlc:item tid="220"/></vlc:node><vlc:node title="soo"><vlc:item tid="236"/><vlc:item tid="237"/><vlc:item tid="238"/><vlc:item tid="239"/></vlc:node><vlc:node title="WC"><vlc:item tid="269"/><vlc:item tid="270"/><vlc:item tid="271"/><vlc:item tid="272"/><vlc:item tid="273"/><vlc:item tid="274"/><vlc:item tid="275"/><vlc:item tid="276"/><vlc:item tid="277"/><vlc:item tid="278"/><vlc:item tid="279"/></vlc:node><vlc:node title="1"><vlc:node title="12"><vlc:item tid="319"/><vlc:item tid="320"/><vlc:item tid="321"/><vlc:item tid="322"/><vlc:item tid="323"/><vlc:item tid="324"/><vlc:item tid="325"/><vlc:item tid="326"/><vlc:item tid="327"/><vlc:item tid="328"/></vlc:node><vlc:item tid="371"/><vlc:item tid="372"/><vlc:item tid="373"/><vlc:item tid="374"/><vlc:item tid="375"/><vlc:item tid="376"/><vlc:item tid="377"/><vlc:item tid="378"/><vlc:item tid="379"/><vlc:item tid="380"/></vlc:node><vlc:item tid="439"/><vlc:item tid="440"/><vlc:item tid="441"/><vlc:item tid="442"/><vlc:item tid="443"/><vlc:item tid="444"/></vlc:node></extension></playlist>
Here is the c# code

private void button4_Click(object sender, EventArgs e)
		{
			XDocument xdoc = XDocument.Load("aaah.xspf");
			XElement playlist = (XElement)xdoc.FirstNode;

			XNamespace ns = xdoc.Root.GetDefaultNamespace();
			XNamespace nx = ("http://www.videolan.org/vlc/playlist/ns/0/");
			var extension = xdoc.Root.Element(ns + "extension");
			var nodes = extension.Descendants(nx + "node").Where(n => n.Elements(nx + "item").Any());


			List<TitleAndIds> titles = nodes.Select(n => new TitleAndIds
												{
													Title = n.Attribute("title").Value,
													Ids = n.Elements(nx + "item").Select(i => int.Parse(i.Attribute("tid").Value)).ToArray()
												}).ToList();


			List<PlaylistItem> fileSignatures = (from file in xdoc.Descendants(ns + "track")
												 select new PlaylistItem
												 {
													 location = (string)file.Element(ns + "location").Value,
													 extensions = (string)file.Element(ns + "extension").Value,
													 duration = (string)file.Element(ns + "duration")
												 }).ToList();


			foreach (var item in titles)
			{
				treeView1.Nodes.Add(new TreeNode(item.Title));


				foreach (var childItem in item.Ids)
				{
					//Remove %20 (spaces)
					var file = System.Net.WebUtility.UrlDecode(fileSignatures[childItem].location);
					//trim file:/// from start
					char[] trimChar = { 'f', 'i', 'l', 'e', '/', ':' };
					file = file.TrimStart(trimChar);


					//treeView1.Nodes[titles.IndexOf(item)].Nodes.Add(new TreeNode(childItem.ToString()));
					treeView1.Nodes[titles.IndexOf(item)].Nodes.Add(new TreeNode(file));
				}
			}

		}

Thanks