Co-created by Ava DuVernay and former 49ers quarterback Colin Kaepernick — who silently took a knee during the US national anthem in 2016 in protest of the racial inequality and indiscriminate killing of Black Americans by police — “Colin in Black and White,” the limited docudrama series from Netflix, follows its subject as he looks back on his formative years as an adopted, biracial high school and college athlete with his eyes set on becoming a professional quarterback.