From the 777 FCOM:
Air Distribution
[-200, -200ER, -200LR, -300, -300ER, -300ER/ULR]
The flight deck receives 100% fresh conditioned air from the left pack. The flight
deck is maintained at a slightly higher pressure than the passenger cabin to prevent
smoke and objectable odors from entering the flight deck.
[777F]
The flight deck and supernumerary cabin receive 100% fresh conditioned air from
the left pack. To prevent smoke and objectionable odors from entering the
occupied compartments, the flight deck and supernumerary cabin are maintained
at a slightly higher pressure than the main deck cargo and lower cargo
compartments.
So the B777 has it.
But I can't find this feature in any of the 744F or -BCF, B767 or MD-11 FCOM's.
But if they had a fire
in the cockpit, like the UAE authorities now seem to report, it wouldn't have done the UPS6 guys much good.