Access Point mode - Guest Network

I've got 2 RT-N66Us on my network. One in Wireless Router mode, the other in Access Point mode. I was setting up Guest Network on each of them (which might be overkill I admit), and I noticed that the setting for Access Intranet is not present on the AP.

Is this an oversight? Should a Guest Network config on a AP be allowed to exclude Intranet traffic? Or does it do so already?

Thanks in advance,

Mike