A simple docker-compose.yml to demo/test things in a very simple swarm cluster (as usual for DinD, NOT RECOMMENDED FOR ANY SERIOUS USE).
$ docker-compose up -d
Creating dindcluster_docker-2_1
Creating dindcluster_docker-3_1
Creating dindcluster_docker-1_1
Creating dindcluster_cluster-store_1
Creating dindcluster_swarm_1
$ export DOCKER_HOST="tcp://$(docker inspect -f '{{ (index .NetworkSettings.Networks "dindcluster_default").IPAddress }}' dindcluster_swarm_1):2375"
$ docker info
Containers: 0
...
Nodes: 3
6f788792e52b: docker-1:2375
└ ID: QZPY:IG6T:DUFJ:V2RQ:RWEO:H3OJ:EGI5:DOWI:MH5B:WFV4:VEUR:SDZR
...
a352ad1cfede: docker-2:2375
└ ID: YO7R:HWND:UI4Z:SXHO:URQJ:HRKA:FPNY:C3K3:MSHK:U3WT:ZUKT:N2YS
...
b1b2d917aab2: docker-3:2375
└ ID: 4CGH:23EW:UC7L:FRTP:RSKD:ARZF:6BMR:IMWG:TN7B:Y6Y5:CXKK:QCFA
...
Plugins:
...
$ docker run -it --rm alpine ls -l
total 52
drwxr-xr-x 2 root root 4096 Jun 2 19:38 bin
drwxr-xr-x 5 root root 380 Jun 18 16:59 dev
drwxr-xr-x 1 root root 4096 Jun 18 16:59 etc
drwxr-xr-x 2 root root 4096 Jun 2 19:38 home
drwxr-xr-x 5 root root 4096 Jun 2 19:38 lib
lrwxrwxrwx 1 root root 12 Jun 2 19:38 linuxrc -> /bin/busybox
drwxr-xr-x 5 root root 4096 Jun 2 19:38 media
drwxr-xr-x 2 root root 4096 Jun 2 19:38 mnt
dr-xr-xr-x 256 root root 0 Jun 18 16:59 proc
drwx------ 2 root root 4096 Jun 2 19:38 root
drwxr-xr-x 2 root root 4096 Jun 2 19:38 run
drwxr-xr-x 2 root root 4096 Jun 2 19:38 sbin
drwxr-xr-x 2 root root 4096 Jun 2 19:38 srv
dr-xr-xr-x 13 root root 0 Jun 18 16:59 sys
drwxrwxrwt 2 root root 4096 Jun 2 19:38 tmp
drwxr-xr-x 7 root root 4096 Jun 2 19:38 usr
drwxr-xr-x 12 root root 4096 Jun 2 19:38 var