d.2d 298 (1979). We have previously employed Imbler's functional approach for determining the de- gree of immunity for prosecutorial activity. See Ybarre r. Reno Thunderbird Mobile Home Village, 723 F.2d 675, 678 (9th Cir. 1984). Quasi-judicial activities are not lim- ited to post-indictment matters, but also include "lijnves