Slamdance Festival’s opening film features a daughter exploring her father’s secrets

Lynne Sachs had already been working as a filmmaker for several years, finding her voice in making personal documentaries, when in 1991 she decided to make a movie about her dad.“I was interested in the ways you could know a person, and to articulate that in film,” Sachs said in a recent interview. “I definitely didn’t know where it was going to go. Or that it would take almost 30 years making it.”Sachs’ long journey toward understanding her father, former Par