Need help remembering the title of this movie. Here’s what I know/remember:

-The movie is probably from the early 2000s-2010ish

-The movie is framed around a white mob boss(?) interrogating his black subordinate about what happened to his the mob boss’ son (among other things). The story is told through the subordinate’s perspective

– One of the main themes of the movie is that people lie during torture to tell you what you want to hear.

– The main character (black gang member) was working with a big white gang member named Rocco or Rocky

-At one point, the two gang members were torturing the mob boss’ son by holding him upside down in a barrel of water. They held him there too long and he ended up dying

-At the end, the mob boss points out that most of what he has been told is a lie (fitting with the theme)

I have tried searching far and wide online, but haven’t been able to figure this one out. I’m guessing it is a lower budget movie overall. Can you help me find this movie please? It’s been haunting me for years!