I do not think it is possible, I am sure there is nothing you can do with xbmc and Apple TV3, I think you can install plex though, I am sure they had a working plex installation, which is similar
@js2 this is not possible mate the simple answer the Apple tv is not jailbroken, ive had an apple tv 2 for years , i sold it and trebled my money a year ago over priced and the specs are poor in relation to an android box, fire tv both quad core boxes cable of running xbmc, and all the goodies, my m8 is capable of running 4k video , and its sports air play , chrome cast, mirroring, there are plenty of other options