This method is designed to be fast, and to returns true if the resource tree
or the virtual folder tree allows the source to access through
the inherited AGO, ACL or PRI rights to the leaf.
This method is designed to be fast, and to returns true it the resource tree
or the virtual folder tree allows the source to access through the inherited rights to the leaf.
Returns true if the Privilege inherited rights in the resources or
the virtual folders tree allows to access to the PrivilegeTarget
for the EligibleParties _ep or _grp.