The percentage of the daily value of fiber that is contained by a food considered to be a "good source of fiber" is 10-19% per serving.
If there is much more fiber in food, that can't be good, and if there is much less of it, that can't be good either. So, balancing the amount of fiber in your food is quite important as it can affect your overall health for the good or the bad, so take care about what you eat.