Unfortunately, the option to restrict the quota check to a specific Q-tree was not implemented in previous releases. We were able to resolve this issue in the beta phase of this check. Our next release 3.9.2 will include the fixed version of check_netapp_quota.pl. Checks such as
./check_netapp_quota.pl -H filer --path=/vol/vol1
are now possible. We removed the option to restrict the check to volumes, since it too was not functional.
We are happy to provide pre releases for testing purposes, simply contact us directly.