Native app is not here yet. You can use RDP however which allows virtually all Android and Apple and Windows tablet/phone devices capable of running SambaPOS all the need is a RDP client app which is available on all 3 platforms.
Below is a tutorial on RDP. It gives you an idea of it. I do not recommend using desktop Client operating system version for this however it is not as efficient and does not support it out of box you have to hack it. I recommend Windows Server Edition in particular the inexpensive Windows Server 2012 Essentials.