I do not know what you are filtering for but the any and the all filter setting is there so that you can use multiple filters and then choose how strick that you want filters to work.
Filters are used to display a particular set of activites to view. One filter or Several Filters can be used together to match the criteria for the activities to display in the schedule.
Use All selected filters when more than one filter is selected, choose to indicate that activities must meet all selection criteria in each filter.
Use Any selected filter: When more than one filter is selected, choose to indicate that activities must meet only one selection criteria in each filter.
The All selection is the strictist which means that ALL of the criterial in the filters selected MUST be met for the data to be displayed.
The Any selection means that any of the criteria for any of the filters select would be displayed.