[Feature Request] Mounting multiple archives to the same path

It would be really convenient if you could mount multiple archives to the same folder.
I use dwarfs to compress warc's and because they are quite large and take a long time to compress, decompressing and recompressing them is not really an option. So i create a new archive every few weeks, i then mount each of them to their own folder and then use mergerfs to mount all of them to a single folder. This is really impractical and it would be great to see this feature implemented into the program.

The issue names no files, tests, or entry points. Start by locating the archive-mount handling and existing mount-related tests, then define and verify the behavior for mounting multiple archives at one path without requiring mergerfs.

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