def __dir__(self):
        """Filter the output of `dir(mock)` to only useful members.
        XXXX
        """
        extras = self._mock_methods or []
        from_type = dir(type(self))
        from_dict = list(self.__dict__)

        if FILTER_DIR:
            from_type = [e for e in from_type if not e.startswith('_')]
            from_dict = [e for e in from_dict if not e.startswith('_') or
                         _is_magic(e)]
        return sorted(set(extras + from_type + from_dict +
                          list(self._mock_children)))