Solaris 10/11: zfs dataset not mounting

Error: zfs dataset not mounting or mountpoint or dataset is busy
# zfs mount -a
cannot mount 'zpauqXXXXs_T2CL_zones_AS/qXXX057z/pXXX01': mountpoint or dataset is busy

Solution:
1>Check is the mount point is busy.
#fuser /mountpoint
/mountpoint:    24253c   16665c

2> Kill the process using the mountpoint

#kill -9 24253 16665

3>Mount all the zfs file systems

#zfs mount -a