Yes
I'm referring to storefronts as they are called in Multivendor Ultimate, not vendor storefronts or vendor administrators. Unfortunately, there's some confusion since vendor storefronts and marketplace storefronts are named the same. I am referring to the Marketplace storefronts and these can be found in "Administration>Storefronts". Maybe I'm missing the settings somewhere, but I don't see a way to restrict Administrators to a specific storefront. Vendor administrators can be restricted to a specific vendor store, but this feature seems to be missing when trying to restrict Administrators to a specific marketplace storefront.