I built a sample plugin using "github.com/docker/go-plugins-helpers/authorization" package.
See https://github.com/artsf/docker-auth-test and it is not getting triggered.
Plugin builds, created and enabled OK, but then it just doesn't work at all.
It does not produce any stdout output and does not block any images from running.

Did I miss anything?

OS:
Mac OS X 10.11.6 (build: 15G1421)

Go:
go version go1.8 darwin/amd64

Docker:
Docker version 17.03.1-ce, build c6d412e

Docker UI:
Version 17.03.1-ce-mac5 (16048)
Channel: stable
b18e2a50cc

Diagnostics:

Docker for Mac: version: 17.03.1-ce-mac5 (b18e2a50c)
macOS: version 10.11.6 (build: 15G1421)
logs: /tmp/2439AFEC-179A-4471-9766-DEEE420D4146/20170405-165618.tar.gz
[OK]     vmnetd
[OK]     dns
[OK]     driver.amd64-linux
[OK]     virtualization VT-X
[OK]     app
[OK]     moby
[OK]     system
[OK]     moby-syslog
[OK]     db
[OK]     env
[OK]     virtualization kern.hv_support
[OK]     slirp
[OK]     osxfs
[OK]     moby-console
[OK]     logs
[OK]     docker-cli
[OK]     menubar
[OK]     disk