Yields all ancestors of a path.

    The ancestors are returned in order from closest to the farthest one.

    Yields:
      Instances of `rdf_objects.PathInfo`.

def GetAncestors(self):
    """Yields all ancestors of a path.

    The ancestors are returned in order from closest to the farthest one.

    Yields:
      Instances of `rdf_objects.PathInfo`.
    """
    current = self
    while True:
      current = current.GetParent()
      if current is None:
        return
      yield current