nerdctl system prune --all --force : not clearing the unused images

### Description

Hi Team,
We are using AWS EKS cluster v1.25. It is supporting containerd. There is some space issue in all worker nodes and seems the EKS garbage collecter is not working as expected. So we manually tried to delete the unsed images using "crictl rmi --prune". But it not worked. Then we connected with AWS team and they recommended to use "nerdctl".
We installed it and ran "nerdctl system prune --all" which again not resolved our space issue. Not sure what is the issue. Need urgent help.

### Steps to reproduce the issue

1.yum install nerdctl -y
2. nerdctl system prune --all
3.

### Describe the results you received and expected

nothing.

### What version of nerdctl are you using?

nerdctl version

Client:
Version:
OS/Arch: linux/amd64
Git commit: .m
buildctl:
Version:

Server:
containerd:
Version: 1.6.6
GitCommit: 10c12954828e7c7c9b6e0ea9b0c02b01407d3ae1
runc:
Version: 1.1.4
GitCommit: 5fd4c4d144137e991c4acebb2146ab1483a97925

### Are you using a variant of nerdctl? (e.g., Rancher Desktop)

None

### Host information

_No response_