How to get the list of feature dataset

[kavyajeetbora]

I want to list down the names of feature dataset.
This is the basic structure of the geodatabase:

Using fiona I am able to get the list of feature classes using:

layers = fiona.listlayers(gdb_filePath)

Can anyone help me to get the list of feature datasets (not feature classes) ?
Using arcpy can be done I guess but don't have it as it needs license. Looking for some solution using opensource libraries like fiona and GDAL, if any