Summary
Microsoft Video-based Screen Sharing (VbSS) is now supported by Skype for Business on Mac users for meetings that are hosted on Skype for Business Server 2015. It's more reliable and faster than the traditional screen-sharing.
How to get this update
To get this update, install the July 2018 cumulative update 6.0.9319.534 for Skype for Business Server 2015, Web Components Server.