31.35. table_privileges

The view table_privileges identifies all privileges granted on tables or views to the current user or by the current user. There is one row for each combination of table, grantor, and grantee. Privileges granted to groups are identified in the view role_table_grants.

Note that the column grantee makes no distinction between users and groups. If you have users and groups with the same name, there is unfortunately no way to distinguish them. A future version of PostgreSQL will possibly prohibit having users and groups with the same name.