Enterpriseアカウントは、GitHub Enterprise Cloud、GitHub AE、GitHub Enterprise Serverで利用できます。
Roles in an enterprise→
Everyone in an enterprise is a member of the enterprise. To control access to your enterprise's settings and data, you can assign different roles to members of your enterprise.
Viewing people in your enterprise→
To audit access to enterprise-owned resources or user license usage, enterprise owners can view every administrator and member of the enterprise.