code: @Override
    public PathImpl getParent()
    {
      if (_pathname.length() <= 1)
        return lookup("/");
  
      int length = _pathname.length();
      int lastSlash = _pathname.lastIndexOf('/');
  
      if (lastSlash < 1)
        return lookup("/");
  
      if (lastSlash == length - 1) {
        lastSlash = _pathname.lastIndexOf('/', length - 2);
        if (lastSlash < 1)
          return lookup("/");
      }
  
      return lookup(_pathname.substring(0, lastSlash));
    }
docs: Return the parent Path