Christopher Vourlias Rising Russian director Vladimir Bitokov’s sophomore effort, “Mama, I’m Home,” bows this week in the Horizons sidebar of the Venice Film Festival. Following on the heels of his 2018 Karlovy Vary premiere “Deep Rivers,” it’s produced by two-time Academy Award nominee Alexander Rodnyansky (“Loveless,” “Leviathan”) and Sergey Melkumov.