moby: Using --tmpfs from non-Linux clients fails because mount flags are undefined

This works on my Linux server:

server$ docker run --rm --tmpfs /run2:ro busybox && echo ok
ok

But if I run the same on my laptop (with DOCKER_HOST appropriately set):

laptop$ docker run --rm --tmpfs /run2:ro busybox && echo ok
docker: Invalid tmpfs option ["ro"].
See 'docker run --help'.

Both machines are running 1.10.2:

server$ docker version
Client:
 Version:      1.10.2
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   c3959b1
 Built:        Mon Feb 22 21:37:01 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.10.2
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   c3959b1
 Built:        Mon Feb 22 21:37:01 2016
 OS/Arch:      linux/amd64

===

laptop$ docker version
Client:
 Version:      1.10.2
 API version:  1.22
 Go version:   go1.6
 Git commit:   c3959b1
 Built:        Tue Feb 23 21:12:32 UTC 2016
 OS/Arch:      darwin/amd64

Server:
 Version:      1.10.2
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   c3959b1
 Built:        Mon Feb 22 21:37:01 2016
 OS/Arch:      linux/amd64

Many thanks in advance.