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If it acted as a block device instead of a file system, you could mount it as any filesystem of your choice.
Yes, but support for implementing block devices as part of userland is a feature of the next kernel, if I understand correctly [0], while FUSE that this is using is available right away.
It could act as an NBD server. The in-kernel client for that has been around since Linux 2.1.x.
What about loopback devices using a FUSE file as the host file?