Securing MSS to see only their positions

I wrote a rule on PAPOSITION  in LS9.0

if(trim(getDBField('EMPLOYEE','POSITION',user.getCompany(),user.getEmployeeId())) == table.SUPERVISOR)    'ALL_ACCESS,' else    'NO_ACCESS,'

This does show only the positions that report to the supervisor in MSS but I can't figure out how I can also show the positions under employess who have their own direct reports. So a Director sees positions that report to him but doesn't see the manager positions. Wondered if anyone has tried this.

Thanks,

Paul