Checkbox Filter by AND instead of OR

This is a great plugin, but I’m struggling with the filters using OR instead of AND. (i.e. inclusive vs. exclusive)

For example, let’s say I want to search nearby farm stands. Product filters include:
– Fruit
– Vegetables
– Eggs

Currently if I select the boxes for ‘Fruit’ and ‘Vegetables’, it will show farm stands that sell EITHER fruits or vegetables, but I want it to show farm stands that sell BOTH.

Thanks in advance for any help!