Sweet! I've been monkeying around with writing an HFS interpreter (in rust ofc). Unfortunately 'fuser' is less than ideal on a Mac. This could be an interesting alternative.

Edit: Oh. It's async. The other bit that I liked from fuser: the default implementations in the trait cut down on the boiler plate. Setting the RO mount option got you defaults that DTRT.

You can interoperate async and threads, but yes you have to tolerate having Tokio or similar as a dep