Sharing the Xserver with docker container

[Tong Sun]

For any Xserver in host, I normally just do the following in the
docker container

export DISPLAY=':0'
xterm &

and I'll be all set.

However, I found that it is not the case for Xserver from macport, as
I see my DISPLAY in my host is

DISPLAY=/private/tmp/com.apple.launchd.DiHpGrxgFr/org.macports:0

How can I share that with my docker container?

thx