I just switched jobs in San Francisco, and part of my search was parental leave. I did not see any companies in the 6-12 month paid parental leave range.

6-20 weeks is the range I saw. Twitter at 20, Square (and I think Facebook) at 16, Google at 12, and most at 6.

I'm totally onboard with it being government funded instead of employer funded. I think tying it to salary (and what people pay in) makes sense, as many people are less likely to take it if it's significantly under their normal income.