Ellise Shafer editorFor all involved in the making of HBO miniseries “I Know This Much Is True,” one word continues to come up when describing the filming process: generosity.This was the word of the hour during the Variety Streaming Room Q&A with writer and director Derek Cianfrance, executive producer and star Mark Ruffalo and cast members Kathryn Hahn, Rosie O’Donnell, John Procaccino, Philip Ettinger and Archie Panjabi.“I don’t think there was a cast member or a crew member that didn’t give