This task describes far-future work.
Currently, Files is roughly a big list of file blobs with no structural information. A separate application, Phragment, provides a directory structure for build artifacts with some special rules, but is primarily not intended to be user-facing.
I'd like to merge Phragment into Files and provide directories within Files, so you can, e.g., create a group of files related to a particular project and organize them into a directory structure. This structure would be versioned and have some special rules to let it replace Phragment completely, but primarily work like normal directories on disk on the OS in a user-facing "folders of stuff" sort of way.
Further in the future, we could write desktop applications to do directory sync.