By Zach Koons The legendary director is filming a documentary on the former NFL quarterback. View the original article to see embedded media. Colin Kaepernick was on hand as a honorary captain and to conduct a workout at halftime of the Michigan spring game on Saturday afternoon. But he wasn’t the only notable figure on hand to take in the Wolverines’ intrasquad scrimmage. Legendary film director Spike Lee was also in Ann Arbor on Saturday to watch the reigning Big Ten champs in action. However, that wasn’t exactly the main reason he was in the Big House. Earlier this year, ESPN Films announce…