How to setup disk quota over NFS volume exported from Netapp?

Issue

• Getting error while checking 'quota' over a netapp volume exported on RHEL client.

node1 ~]# quotacheck  -cvugm  /mnt/iotest
quotacheck: Skipping nas01:/vol/iotest [/mnt/iotest]
quotacheck: Cannot find filesystem to check or filesystem not mounted with quota option.

node1 ~]# mount
/dev/mapper/vg_vmlinux-lv_root on / type ext4 (rw,usrquota)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/sda1 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
nas02:/vol/fv_Data/737 on /home/prod737/Data type nfs (rw,rsize=8192,wsize=8192,bg,addr=10.86.140.23)
nas03:/vol/iotest on /mnt/iotest type nfs (rw,addr=10.86.130.22)

node1 ~]# uname -a
Linux node1  2.6.32-220.el6.i686 #1 SMP Wed Nov 9 08:02:18 EST 2011 i686 i686 i386 GNU/Linux