some small observations about nfs, autofs, exfat

You can nfs-export an autofs-mounted filesystem that's on a local device.

You can't export an exfat filesystem over nfs.  exportfs(8) will say "exportfs: /foo does not support NFS export".

exfat is also annoying in other ways on linux.  Even if you just want the contents of the fs to be accessible to whatever it's plugged in to, and don't think you need multi-user features, it's hard to get this on linux.  With unix permissions, you can make something that anyone can read and anyone can create directories in, more or less.  With exfat on linux, it's either mounted as root or as a particular user (and group).

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