fuser on NFS

We mount from a NetApp filer the following:

netapp:/volume1/qtree1 under mountpoint /abc
and
netapp:/volume1/qtree2 under mountpoint /xyz
--> diferent qtrees in one volume.

fuser -mk /abc shows also the processes for /xyz (different qtree same voume)
We want to use fuser -k command to kill processes before umounting the filesystem /abc
but not kill the procs for /xyz