So does 9P. It's just a protocol, at the end of the day. FUSE is actually specific to the Linux VFS subsystem. However, there have been many reimplementations

So does 9P. It's just a protocol, at the end of the day. FUSE is actually specific to the Linux VFS subsystem. However, there have been many reimplementations on the API compatibility level, even though there is no formal standard beyond the header file, which has seen several divergences.