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NFS exporting is supported in Linux kernels 2.6.27 or later.

You need to add an fsid=NNN option to /etc/exports to make exporting a
FUSE directory work.

Filesystem support
------------------

NFS exporting works to some extent on all fuse filesystems, but not
perfectly.  This is due to the stateless nature of the protocol, the
server has no way of knowing whether the client is keeping a reference
to a file or not, and hence that file may be removed from the server's
cache.  In that case there has to be a way to look up that object
using the inode number, otherwise an ESTALE error will be returned.

1) low-level interface

Filesystems need to implement special lookups for the names "." and
"..".  The former may be requested on any inode, including
non-directories, while the latter is only requested for directories.
Otherwise these special lookups should behave identically to ordinary
lookups.

2) high-level interface

Because the high-level interface is path based, it is not possible to
delegate looking up by inode to the filesystem.

To work around this, currently a "noforget" option is provided, which
makes the library remember nodes forever.  This will make the NFS
server happy, but also results in an ever growing memory footprint for
the filesystem.  For this reason if the filesystem is large (or the
memory is small), then this option is not recommended.