NFS mount of NTFS volume using root user hangs

• ONTAP 9
• NTFS security style volume
• NFS client

• NFS mount of an NTFS volume hangs, times out, or permission is denied using root user
• Export policy rules grant the client read and write access to the volume

cluster1::> vserver export-policy check-access -vserver vs1 -client-ip 10.22.32.42 -volume vol4 -authentication-method sys -protocol nfs3 -access-type read-write
                                         Policy    Policy       Rule
Path                          Policy     Owner     Owner Type  Index Access
----------------------------- ---------- --------- ---------- ------ ----------
/                             default    vs1_root  volume          1 read
/dir1                         default    vs1_root  volume          1 read
/dir1/dir2                    default    vs1_root  volume          1 read
/dir1/dir2/flex1              data       vol4      volume         10 read-write
4 entries were displayed.