Create a custom function for populating gravity forms

Hi Everyone, I was wondering if someone could me write a custom function to dynamically populate a gravity forms multiselect field?

I've already created a custom user meta field called "Company". On the gravity form, I'd like to show a list of wordpress users who's "company" value matches that of of the current logged in user.

I know that I'm probably going to need to use the get_users function and then meta_compare but I'm just not proficient enough to code it from scratch. Can anyone help my providing me with an example or explanation?

Thanks in advance

Tom