DestinationSubDirectory does not work recursively

This is a bit of an unexpected behavior for me, although I doubt it counts as a bug given that it probably wasn't intended.

the `` attribute works fine when we are talking about implicit references. But I would have expected it to work recursively up the directory structure. To this end I have created a reproduction repository:
https://github.com/CEbbinghaus/DestinationSubDirectoryRepro

It's probably not trivial to implement but having functionality like this would go a long way to keeping the root directory clear and being able to better organize libraries.