@Override
    public boolean isChildOf(ImmutableContextSet contexts, LPSubjectReference parent) {
        return parent.collectionIdentifier().equals(PermissionService.SUBJECTS_GROUP) &&
                getPermissionValue(contexts, Inheritance.key(parent.subjectIdentifier())).asBoolean();
    }
Implements {@link LPSubject} for a {@link PermissionHolder}.
sponge/src/main/java/me/lucko/luckperms/sponge/service/model/permissionholder/PermissionHolderSubject.java