def ls_r(self, path, absolute=False):
        node = self._fetch_node(path)
        if absolute:
            selector_func = self._metadata_path_selector
        else:
            selector_func = self._up_to_root_selector
        return [selector_func(node, child_node)
                for child_node in node.bfs_iter()]
Return list of all children of the given path (recursively).
dataset/ETHPy150Open openstack/taskflow/taskflow/persistence/backends/impl_memory.py/FakeFilesystem.ls_r