How to find the parent of subcommand?

In case of subcommands, how to find the parent command, using the ishell context of the sub command?

For example:
Say mycmd and newcmd has 2 subcommands:

```
mycmd help
add del

newcmd help
add del
```

The handler for add receives the ishell.Context. How to figure if the parent of add is mycmd or newcmd?