List the roles that this role is member of

get-rolememberof.ps1

function Get-RoleMemberOf{
    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$true, Position=0)]
        [string]$Identity
    )
  $role = Get-Role $Identity
  return Get-Role -Filter * | Where-Object { $_.IsMember($role,$true,$true) -and $_ -ne $role } 
}

Write-Host "The role Developer is member of" -ForegroundColor Green
Get-RoleMemberOf "sitecore\developer"

Write-Host "The role Author is member of " -ForegroundColor Green
Get-RoleMemberOf "sitecore\author"

# Displays member of for list of roles
$roles = Get-Role -Filter sitecore* 
foreach( $role in $roles)
{
    Write-Host "The role $($role.Name) is member of" -ForegroundColor Green  
    Get-RoleMemberOf $role.Name
}

Will this help? SitecorePowerShell/Console#842

Thanks for sharing.