Add capability to see who is using a NFS mount

I have a sandbox lpar (GDI) exporting a directory for testing this issue.
EXPORTFS OPTIONS('-I -O') DIR('/tmp')
strNFSSVR SERVER(*ALL)

I have another lpar mounting over this
md '/gdi'
md '/gdi/tmp'
MOUNT TYPE(*NFS) MFS('gdi:/tmp') MNTOVRDIR('/gdi/tmp')
OPTIONS('rw,suid,retry=5,rsize=32768,wsize=32768,timeo=20,retrans=5,
acregmin=30,acregmax=60,acdirmin=30,acdirmax=60,soft,async,
sec=sys,vers=3:2,nocache')
Then I use it with:
edtf '/gdi/tmp/test.txt'

From another session I am trying to see if I can tell who is using that mount.

The following returns nothing:
SELECT * FROM TABLE(QSYS2.IFS_OBJECT_LOCK_INFO(PATH_NAME => '/gdi/tmp'));

The following returns data, but I may not know the exact file they are working on:
SELECT * FROM TABLE(QSYS2.IFS_OBJECT_LOCK_INFO(PATH_NAME => '/gdi/tmp/test.txt'));

This doesn't return a hit:
SELECT * FROM QSYS2.NETSTAT_INFO
WHERE REMOTE_ADDRESS = '10.10.6.144';
unless I start some other communication to that lpar.

The old Navigator (http://gdisys:2001) has this:
https://www.ibm.com/docs/en/i/7.4?topic=i-working-dynamically-mounted-file-systems
But the new Navigator (http://gdisys:2002/Navigator) does not so I'm guessing there's currently no sql service for this information.
The information from the old Navigator does list the mount but does not say whether or not it is in use or by whom.

The problem is that if I go to unmount that, it generates "CPFA09E Object in use". I'm trying to figure out who is using it.