func fieldDecimal(_ fieldno: Int) -> Int

The function fieldDecimal() returns a length of a fractinal part of a field by index.
It is suitable only for Numeric, Float, Double fields. For other types it returns 0.
It also returns 0 if index is out of range.

{
    // your code
    for i = 0...dbf.fieldCount()-1 {
        print( dbf.fieldDecimal( i ) )
    }
    // your code
}