Anyone written a fold operation over Zipper navigation operations using 
tomjkidd/elm-multiway-tree-zipper?

http://package.elm-lang.org/packages/tomjkidd/elm-multiway-tree-zipper/1.10.2/MultiwayTreeZipper

The zipper navigation operations generally take the form Zipper a -> Maybe 
(Zipper a).

I'd like some kind of fold operation that repeatedly applies the zipper 
navigation until it reaches a Nothing. This will be useful for implementing 
various walks over a tree, visit all child nodes, depth first walk, walk up 
to root etc, and to gather all nodes encountered along a walk.

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