How split the path from bottom to top

var path = "C:\Program Files\Test1\Test2\Test3\Test4";

var pathItems = path.Split('\');

var paths = new List<string>();

for(var i = 0; i < pathItems.Length; i++)
{
    var items = pathItems.Skip(0).Take(i+1).ToArray();

    paths.Add(string.Join(@"\", items);
}

public void mysplit(string path)
{
  string[] sa = path.Split(new char[]{'\\'});

  for (int i=0; i < sa.Length; i++)
  {
    string s = (i+1) + "." + sa[0];
    for (int j=1; j<=i; j++)
    {
      s += "\\" + sa[j];
    }
    Console.WriteLine(s);
  }
}

<pre lang="cs">var path = @"C:\Program Files\Test1\Test2\Test3\Test4";

var pathItems = path.Split('\\');

List<String>  paths = new List<String>();
int i=0;
var seed = pathItems[i];

while(i < pathItems.Length-1)
{
paths.Add(seed);
seed = Path.Combine(seed, pathItems[i+1]);
i++;
}
paths.Add(seed);