Forcing Google Safe Search

[r0utevv3]

In OpenWrt Firmware there is a host file where you can enforce google safe search putting something like:
216.239.38.120    www.google.com    #forcesafesearch
Is there something simmilar in pfsense?, if not, how can I enforce safe Search redirecting urls. (By the way the "Enable Safe Search" Option of squidguard seems that it doens't work, so I can't use it )