Is there anyway I can get all the xpaths in a yang file with groupings ?

[sarveshwar22]

I was using pyang to get xpaths of a particular yang file like native.yang by doing pyang -f flatten -p {repo} {yang_file}​
I have some yang files like snmp.yang where the structure of yang file is like this -

module snmp{

grouping A {
}
grouping C{
}
grouping D{
}

augment B{
uses A
}

}

This command is returning empty list here. Any leaf/container under any grouping is not getting displayed. Any approach to solve this so that all xpaths would be returned?