Part’s parent content-type

When iterating through the parts of a MIME::Entity using parts_DFS, what would be the best way to get a reference to a part’s parent entity or parent entity type? I’m trying to do some logic on an HTML part depending on if the parent type is multipart/related or not.  I was thinking of just setting a variable as I iterate through the parts, but it can get tricky if I don’t know the depth level I’m at. 
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