FUSE is used to present a file system interface of something that isn’t a file system. E.g. present an LDAP directory as a file system.

Writing FUSE drivers is pretty frustrating, though, and not well supported by all OSs.

My takeaway is that this project discards FUSE in favour of making an NFS server that can be easily extended to do the same thing: present non-file system systems as mountable nfs remote file systems.

It’s a neat idea, and does avoid any extra kernel drivers, etc. A safer abstraction at the cost of adding a network stack and NFS’s sometimes wonky effects (especially with hard mounts).

This NFS Server on one side, and the OS's builtin NFS client on the other.

It appears as a network drive on all major operating systems and can be accessed as any other local filesystem (through kernel syscalls).