I am trying to NFS export a FAT32 formatted external USB device, which fails with the error:

/sbin/nfsd: Can't export /Volumes/<external>: Operation not supported (45)

I am able to export internal/HFS drives, which have the "Owners Enabled: Yes" attribute, and therefore assume I need to set the flag accordingly on my external drive.

Despite the fact that the device has been assigned a uuid (it appears to be in place in .fseventsd and running 'repair disk' echos it in syslog), I get this error when running vsdbutil:

vsdbutil: Couldn't update volume information for '/Volumes/<external>/': Invalid argument
vsdbutil: no valid volume UUID found on '/Volumes/<external>/': Invalid argument

And diskutil returns this:

Permissions are not enabled on the disk (-9973)

I attempted to add the uuid to /var/db/volinfo.database in order to set the permissions there, to no effect.

I don't believe that I am the only person who has attempted this, but I can find no evidence to the contrary.

vsdbutil -a </mount/point>

Though nearly every switch, and combination of switches and/or mount point vs. disk device (i.e. disk2s1) returns that same error.