Luis Bunuel's 1964 Diary of a Chambermaid, his first collaboration with Jean-Claude Carriere (the two would later work together on The Discreet Charm of the Bourgeoisie), is actually the second adaptation of Octave Mirbeau's novel. The other was made by Jean Renoir in Hollywood in 1946, and while I've not seen it I'm betting it's quite a different film.