Segmentation of services can be achieved by doing channel layering with Fortinet Infrastructure WiFi(SCA). By doing so you actually separate business critical traffic from your non critical and Guest traffics.
There are applications like VO-WIFI and few other low latency sensitive application that need special care taken.
#Wired infrastructure :You deploy a separate Vlan and end-end QOS written and so.
#On WIFI Controller you can do inbound/outbound QOS
#The WMM supported clients have TX-OP /Access category Q for prioritizing the voice/video traffic.
In a SCA you further get the opportunity to do Segmentation of services by creating a separate RF space for them.