Why does not the rmdir command fail when deleting a non-empty directory from a CIFS share mounted with version higher than 1.0 in RHEL 7 ?

Issue

• The command rmdir wrongly returns rc=0 when deleting a directory that it's not empty in a CIFS share mounted with version >1.0:

root@rhel-7.3 # cd /cifsmount/ && mkdir directorytest && touch directorytest/filetest
root@rhel-7.3 # rmdir directorytest 
root@rhel-7.3 # echo $?
0

• It's expected that the command rmdir will return a return code different than 0 because this command cannot delete directories that are not empty.