$ docker-machine config default
--tlsverify
--tlscacert="/Users/nathanleclaire/.docker/machine/certs/ca.pem"
--tlscert="/Users/nathanleclaire/.docker/machine/certs/cert.pem"
--tlskey="/Users/nathanleclaire/.docker/machine/certs/key.pem"
-H=tcp://192.168.99.100:2376

$ docker $(docker-machine config default) version
Client:
 Version:      1.12.5
 API version:  1.24
 Go version:   go1.6.4
 Git commit:   7392c3b
 Built:        Fri Dec 16 06:14:34 2016
 OS/Arch:      darwin/amd64

Server:
 Version:      1.12.5
 API version:  1.24
 Go version:   go1.6.4
 Git commit:   7392c3b
 Built:        Fri Dec 16 06:14:34 2016
 OS/Arch:      linux/amd64

$ docker-machine config default
--tlsverify
--tlscacert="/Users/nathanleclaire/.docker/machine/certs/ca.pem"
--tlscert="/Users/nathanleclaire/.docker/machine/certs/cert.pem"
--tlskey="/Users/nathanleclaire/.docker/machine/certs/key.pem"
-H=tcp://192.168.99.100:2376

$ docker $(docker-machine config default) version
could not read CA certificate "\"/Users/nathanleclaire/.docker/machine/certs/ca.pem\"": open "/Users/nathanleclaire/.docker/machine/certs/ca.pem": no such file or directory

$ docker --version
Docker version 1.13.0-rc4, build 88862e7