param([ValidateSet('KB','GB','TB')]$SizeUnitName = 'GB')
$local:zpool_cmd =  $null
$local:excludeType = ''

$script:SizeUnit = Invoke-Expression "1$SizeUnitName"
$script:SizeRound = 2
$SizeUnit /= 1KB

function NewDataRow{param($Size,$Used,$Available,$Percent,$Source,$FSType,$Target)
    [PSCustomObject]@{
        "Size$SizeUnitName"      = [Math]::Round($Size     /$SizeUnit, $SizeRound)
        "Used$SizeUnitName"      = [Math]::Round($Used     /$SizeUnit, $SizeRound)
        "Available$SizeUnitName" = [Math]::Round($Available/$SizeUnit, $SizeRound)
        'Used%'                  = [int]($Percent -replace '%$','')
        Source                   = $Source
        FSType                   = $FSType
        Target                   = $Target
        SourceLevel              = $(if($Source[0] -eq '/') { 1 } else {0}) + $Source.Split('/').Count - 1
        TargetLevel              = $(if($Target[0] -eq '/') { 1 } else {0}) + $Target.Split('/').Count - 1
        Group                    = $(switch( $FSType ) { 'zfs' { "$FSType`:$($Source.Split('/')[0])" } 'cifs' { "$FSType`:$($Source.Split('/')[2])" } default { $Source }} )
    }
}

$local:df = @()
& df '--output=size,used,avail,pcent,source,fstype,target' |
    Select-Object -Skip 1 | ForEach-Object {
        $local:df = $_.Split(' ', [StringSplitOptions]::RemoveEmptyEntries)
        NewDataRow $df[0] $df[1] $df[2] $df[3] $df[4] $df[5] $df[6]
    } |
    Group-Object -Property FSType |
    ForEach-Object {
        if( $_.Name -eq 'zfs' ) { $_.Group | Group-Object -Property Group | ForEach-Object { $_.Group | Select-Object -First 1 } }
        else { $_.Group }
    } |
    Select-Object -Property "Size$SizeUnitName","Used$SizeUnitName","Available$SizeUnitName",'Used%',Source,FSType,Target |
    Sort-Object -Property FSType,Target