I found an article for you, which breaks it down for the prior year. And it explains that holdings will vary year to year, so the fund may or may not qualify, year to year.

https://thefinancebuff.com/best-vanguard-money-market-fund-your-tax-rates.html

This is assuming CA treats Bills the same as Notes and Bonds. Most often, for mutual funds, I just look for "Govt Ob."