public void Add(IFileSystemProvider fss)
 {
     Providers.Add(fss);
     foreach (var fs in fss.GetFileSystems())
     {
         FileSystems.Add(fs);
     }
 }
		public void Add (IFileSystemProvider fss)
		{
			Providers.Add (fss);
			foreach (var fs in fss.GetFileSystems ())
				FileSystems.Add (fs);
		}