Inconsistent behavior between label and label! filters in volume prune #6918

docker volume create --label a=b --label b=c vol1 && docker volume create --label a=b --label b=c --label d=e vol2 && docker volume create --label b=c --label c=d vol3

docker volume  prune --all --filter label=a=b --filter label=y=y
*no deleted volumes*

docker volume  prune --all --filter label!=a=b --filter label!=y=y
Deleted Volumes:
vol1
vol2
vol3

Client:
 Version:           29.3.1
 API version:       1.54
 Go version:        go1.25.8 X:nodwarf5
 Git commit:        1.fc43
 Built:             Wed Mar 25 00:00:00 2026
 OS/Arch:           linux/amd64
 Context:           default

Server:
 Engine:
  Version:          29.3.1
  API version:      1.54 (minimum version 1.40)
  Go version:       go1.25.8 X:nodwarf5
  Git commit:       1.fc43
  Built:            Wed Mar 25 00:00:00 2026
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          2.1.6
  GitCommit:        1.fc43
 runc:
  Version:          1.4.1
  GitCommit:        
 tini-static:
  Version:          0.19.0
  GitCommit:

Client:
 Version:    29.3.1
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  0.31.1
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 29.3.1
 Storage Driver: overlayfs
  driver-type: io.containerd.snapshotter.v1
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 CDI spec directories:
  /etc/cdi
  /var/run/cdi
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: /usr/bin/tini-static
 containerd version: 1.fc43
 runc version: 
 init version: 
 Security Options:
  seccomp
   Profile: builtin
  selinux
  cgroupns
 Kernel Version: 6.19.10-200.fc43.x86_64
 Operating System: Fedora Linux 43 (Workstation Edition)
 OSType: linux
 Architecture: x86_64
 CPUs: 14
 Total Memory: 30.76GiB
 Name: sbrauner-thinkpadt14gen6.tpb.csb
 ID: bfa28d86-9769-4985-99a5-75ec2afd61fd
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  ::1/128
  127.0.0.0/8
 Live Restore Enabled: false
 Firewall Backend: iptables+firewalld