def GetRootFileEntry(self):
    """Retrieves the root file entry.

    Returns:
      VShadowFileEntry: file entry or None if not available.
    """
    path_spec = vshadow_path_spec.VShadowPathSpec(
        location=self.LOCATION_ROOT, parent=self._path_spec.parent)
    return self.GetFileEntryByPathSpec(path_spec)