Files Open by Process?

What command would tell me how many files a particular process has open (AFP and Kern)? Nigel's AFP Tuning post has dramitcally improved my network homedir performance issues. I'm curious, however, if I need to go higher with maxkernfiles and maxfilesperprocess. https://www.afp548.com/article.php?story=20060329213629494&query=afp%2Btuning