Permissions given by the GRANT statement are stored in the SYSTABLEPERM system view.
Each row in this view corresponds to one table, one user ID granting the permission (grantor) and one user ID granted the permission (grantee). The underlying system table for this view is ISYSTABLEPERM.
The SYSTABLEPERM view is a SQL Anywhere system view. See SQL Anywhere 11.0.1 > SQL Anywhere Server - SQL Reference > System Objects > Views > System views > SYSTABLEPERM system view.