DevCtrl Mini-filter handler not catching some IOCTLs

I am trying to catch Lanman IOCTLs that deal with remote file
copy/move operations, as mentioned a long while ago on this list.
However, I am missing a callback for them. I get a FastIo callback,
which I fail with a general DISALLOW_FAST_IO, but I notice from
FileMon output that there is another IRP_MJ_DEVICE_CONTROL which
succeeds, and I do not have any call inside the IRP_MJ_DEVICE_CONTROL
handler for the files in question.

Am I supposed to handle another IRP_MJ for this case?

Kind regards, Dejan.