100G on docker, don't know were to start. overlay2 directory

Hello guys,

I move my docker from raspberry pi to a VM with Debian 11 about 6 month ago, and the usage space had been increasing like crazy.

I made a du to he directory and this was the result that matters:

/var/lib/docker/overlay2# du -shc ./* | grep G

1.3G ./1cc5bd64e4cdfbe9340538a0c59c13b51df3b68513870eb6c9203a85697e196b
87G  ./7ce2ac508820e515b8d3060f15a6cba486cd11d33a9ae5434ee73a2b32370c0d
93G  total

On the container, I have only a few container, that don't need space:

/var/lib/docker/overlay2# docker ps
CONTAINER ID   IMAGE                                  COMMAND                  CREATED        STATUS                  PORTS                                                                                                                             NAMES
6dcbbeb061d1   nodered/node-red:latest                "./entrypoint.sh"        3 months ago   Up 7 days (healthy)                                                                                                                                       node-red-node-red-1
2866842edde4   lscr.io/linuxserver/unifi-controller   "/init"                  3 months ago   Up 7 days                                                                                                                                                 unifi-controller
9be358453477   eclipse-mosquitto                      "/docker-entrypoint.…"   3 months ago   Up 7 days               0.0.0.0:1883->1883/tcp, :::1883->1883/tcp, 0.0.0.0:9001->9001/tcp, :::9001->9001/tcp                                              mosquitto
1840db78e192   oznu/homebridge:ubuntu                 "/init"                  3 months ago   Up 7 days                                                                                                                                                 homebridge-homebridge-1
a891c1d181ea   pihole/pihole:latest                   "/s6-init"               3 months ago   Up 7 days (unhealthy)                                                                                                                                     pihole
6a45db654e3d   portainer/portainer-ce:latest          "/portainer"             3 months ago   Up 7 days               0.0.0.0:8000->8000/tcp, :::8000->8000/tcp, 0.0.0.0:9000->9000/tcp, :::9000->9000/tcp, 0.0.0.0:9443->9443/tcp, :::9443->9443/tcp   portainer

This is the local dock user space, for config and some data bases.

~/docker$ sudo du ./* -hsc
20K     ./dashy
4.0K    ./docker-compose.yaml
20K     ./filebrowser
8.0K    ./filwbrowser
178M    ./homebridge
936K    ./influxdb
809M    ./librenms
1.8M    ./mosquitto
3.3M    ./nginx
52M     ./node-red
11M     ./node-red2
17M     ./pihole
143M    ./resol
29M     ./resol-docker
560M    ./unifi
16K     ./wg-easy
1.8G    total

How can I check the long directory names belong to container?

7ce2ac508820e515b8d3060f15a6cba486cd11d33a9ae5434ee73a2b32370c0d

Thank you.

Kind regards, LL