# ln -s /my/dir /exports/dir

/exports *(async,rw,fsid=0,no_root_squash,insecure,no_subtree_check,crossmnt)

# mount -t nfs4 192.168.1.52:/dir /mnt

mount -t nfs4 192.168.1.52:/export/dir /mnt

mkdir /exports/dir
mount --bind /my/dir /exports/dir

/my/dir  /exports/dir   none    bind  0  0