IFS_OBJECT_STATISTICS equivalent over mounted drive?

I am trying to verify that folder names in a control file do exist on the
IFS/mounted drive.
I can use this SQL, and it appears to work over an IFS drive.
SELECT ftpdir, c.*
FROM myLibrary.myCtrlFile c
WHERE *UPPER*(ftpdir) NOT IN
(SELECT *UPPER*(*SUBSTR*(PATH_NAME, *16*, *15*))
FROM TABLE (QSYS2.IFS_OBJECT_STATISTICS('/home/myFolder/', 'YES'
, '*ALLDIR'))
)
But my directory is a mounted drive. IFS_OBJECT_STATISTICS will not work
over mounted drives.
Do I have any other options?