“Fruitvale Station” (2013) is based on a true story about a police shooting. I don’t know how much is based and how much is true. That may matter from a political standpoint, but not from a cinematic standpoint. On its own, it’s a film well worth seeing. I don’t like to use reviewer cliches, but edgy and spellbinding come to mind as I think about this day-in-the-life story. It’s ultimately a sad day in a sad life, and we kinda know from the beginning where things are headed, but we go along, not out of voyeurism, but to bear witness.