I don't think we see Banquo's funeral in the play. We see the hitmen (that Macbeth hires) kill Banquo and that Fleance escapes. And then we see the Banquet that is held for Banquo and then his ghost appears and freaks the living daylights out of Macbeth!
So I'm pretty such there is no funeral for Banquo in the play.
Hope this helps!!
