skaffold inspect command does not show all supported flags for its subcommands

Currently if you attempt to list flags for skaffold inspect, the inherited flags from the root command are not shown. UX-wise I believe this is confusing as it would be hard to find all of the supported flags for the command. Below is an example showing this:

aprindle@aprindle ~/skaffold  [inspect-tests-add-test-type]$ skaff inspect build-env list --help
Print the list of active build environments.

Examples:
  # Get list of target build environments with activated profiles p1 and p2
  skaffold inspect build-env list -p p1,p2 --format json

Options:
  -p, --profile=[]: Profile names to activate

Usage:
  skaffold inspect build-env list [flags] [options]

Use "skaffold options" for a list of global command-line options (applies to all commands).

aprindle@aprindle ~/skaffold  [inspect-tests-add-test-type]$ skaffold inspect --help
Helper commands for Cloud Code IDEs to interact with and modify skaffold configuration files.

Available Commands:
  build-env   Interact with skaffold build environment definitions.
  modules     Interact with configuration modules
  profiles    Interact with configuration profiles

Use "skaffold <command> --help" for more information about a given command.