Complete for git checkout, but not for git checkout -b

[mathomp4]

I'm very new to fzf-tab and I'm sure my setup is all kinds of broken, but I'm learning.

My current question is this. When I do git checkout <tab> I get a list of all the branches it looks like that I could checkout. Cool. But when I do git checkout -b <tab> (accidentally because I'm an idiot), I get the same list. When I do git checkout -b I usually want to make a new branch, so I'd like to know if there's a way to "suppress" fzf-tab if I have the -b option?

Note that per the README, I took the "suggestions" and have:

# disable sort when completing `git checkout`
zstyle ':completion:*:git-checkout:*' sort false

so I guess that effects git-checkout, but I'm not smart enough to figure out if I can do the -b bits as well.