‘Martha & Ethel’

In this outstanding and unusual 1995 documentary producer-director Jyll Johnstone and co-producer Barbara Ettinger, friends since childhood in Manhattan, are telling us about their own nannies and their own families. They are in no way apologetic about their privileged backgrounds, and they get their nannies, Martha (Kniefel, left) and Ethel (Edwards, right), respectively, to open up (Cinemax Thursday at 6:20 a.m.).