Linux(and windows) file permission in ManifoldCF

I have been working on a project based on file system crawling through ManifoldCF and indexing it through Solr. While crawling, manifold initially doesn't look for file permissions and hence it does not shows up on the query list of Solr 7.1.
To add custom fields we need to edit mcf-filesystem-connector.jar present in apache-manifoldcf-2.9-bin\apache-manifoldcf-2.9\connector-lib .
If there any method already present to get file permissions and linux qgroups without editing the source code since I am looking for version flexibility, it would be very helpful.

I am just starting up with ManifoldCF so it would be really helpful if you guide me through the process. Thanks in advance.