def filter(self: DataTree, filterfunc: Callable[[DataTree], bool]) -> DataTree:
        """
        Filter nodes according to a specified condition.

        Returns a new tree containing only the nodes in the original tree for which `fitlerfunc(node)` is True.
        Will also contain empty nodes at intermediate positions if required to support leaves.

        Parameters
        ----------
        filterfunc: function
            A function which accepts only one DataTree - the node on which filterfunc will be called.

        Returns
        -------
        DataTree

        See Also
        --------
        match
        pipe
        map_over_datasets
        """
        filtered_nodes = {
            path: node.dataset
            for path, node in self.subtree_with_keys
            if filterfunc(node)
        }
        return DataTree.from_dict(filtered_nodes, name=self.name)

        Filter nodes according to a specified condition.

        Returns a new tree containing only the nodes in the original tree for which `fitlerfunc(node)` is True.
        Will also contain empty nodes at intermediate positions if required to support leaves.

        Parameters
        ----------
        filterfunc: function
            A function which accepts only one DataTree - the node on which filterfunc will be called.

        Returns
        -------
        DataTree

        See Also
        --------
        match
        pipe
        map_over_datasets
        
xarray/core/datatree.py