I’m with the same problem
➜ luk4z7 uname -a Darwin luk4z7 16.0.0 Darwin Kernel Version 16.0.0: Tue Jun 28 15:57:40 PDT 2016; root:xnu-3757.0.0.0.1~20/RELEASE_X86_64 x86_64
➜ luk4z7 docker --version Docker version 1.12.0-rc3, build 91e29e8, experimental
➜ luk4z7 sw_vers ProductName: Mac OS X ProductVersion: 10.12 BuildVersion: 16A239j