How to list available options of git sub command

Question

I know that there is git stash show -p to show the diff of the stash. But When I do git stash show -h it does not show the available options. Where can I find the available options for git stash show command? Note that I want the options for show sub command not stash

git stash show -h
usage: git stash list [<options>]
   or: git stash show [<options>] [<stash>]
                       ^^^^^^^^^ How can I find available options for git stash show?
   or: git stash drop [-q|--quiet] [<stash>]
   or: git stash ( pop | apply ) [--index] [-q|--quiet] [<stash>]
   or: git stash branch <branchname> [<stash>]
   or: git stash clear
   or: git stash [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]
                 [-u|--include-untracked] [-a|--all] [-m|--message <message>]
                 [--pathspec-from-file=<file> [--pathspec-file-nul]]
                 [--] [<pathspec>...]]
   or: git stash save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]
                 [-u|--include-untracked] [-a|--all] [<message>]