gistfile1.txt

https://www.jdoodle.com/compile-c-sharp-online/
mono 5.10.1

```
path = tmp/aaa
parentPath = tmp
```

gistfile2.txt

https://www.jdoodle.com/compile-c-sharp-online/
mono 6.0.0

```
path = tmp/aaa
parentPath = /home/tmp
```

main.cs

using System;
using System.IO;

class Program
{
    static void Main() {
        var path = "tmp/aaa";
        System.Console.Write($"path = {path}\n");
        var parentPath = Directory.GetParent(path).ToString();
        System.Console.Write($"parentPath = {parentPath}\n");
    }
}