Is there any way to forward Mac OS ssh-agent into container yet?

I want to able to forward running ssh-agent on mac into a docker container so git can be used inside the container to pull private repos without requiring passphrase. Using - v $SSH_AUTH_SOCK:$SSH_AUTH_SOCK -e $SSH_AUTH_SOCK in the docker run command works in ubuntu but not on mac. Looking or a solid way to do this without requiring the use of a separate container. Any ideas/solutions? Thanks!