[Plugin: WordPress SEO by Yoast] Only show metaboxes for Administrators

Hi,
I’ve just switched to this plugin from SEO Ultimate.

I was wondering if there is an easy way (functions.php) to only show the SEO metabox for WordPress Administrator (10) users. I do not want to give all my clients access to their SEO.

Thanks

http://wordpress.org/extend/plugins/wordpress-seo/