`docker compose stop SERVICE` also stops dependencies

[tehhowch]

Description

docker compose stop SERVICE stops not only service, but also all of service's dependencies.
docker-compose stop SERVICE stops only the named service.

Steps to reproduce the issue:

1. Have some service dependencies specified in docker-compose file.
2. Start the service with dependencies
3. Attempt to stop only the service and not its dependencies

Describe the results you received:
Multiple services began stopping.

Describe the results you expected:
Only the named service(s) should have stopped.

Additional information you deem important (e.g. issue happens only occasionally):

If this is the intended default behavior, then perhaps a flag (e.g. --only) should be included that allows docker compose stop --{flagname} SERVICE to provide the behavior of docker-compose stop SERVICE.

Output of docker version:

Client: Docker Engine - Community
 Cloud integration: 1.0.12
 Version:           20.10.5
 API version:       1.41
 Go version:        go1.13.15
 Git commit:        55c4c88
 Built:             Tue Mar  2 20:13:00 2021
 OS/Arch:           darwin/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.5
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       363e9a8
  Built:            Tue Mar  2 20:15:47 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.4
  GitCommit:        05f951a3781f4f2c1911b05e61c160e9c30eaa8e
 runc:
  Version:          1.0.0-rc93
  GitCommit:        12644e614e25b05da6fd08a38ffa0cfe1903fdec
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

Output of docker context show:

default

Output of docker info:

n/a

Additional environment details (AWS ECS, Azure ACI, local, etc.):
n/a