I have noticed that if one wants to filter based on a nested element/field using the SWSD API, you actually can't. For example, if I want to find all the hardware owned by John Doe, we need to first look at how owner's are attached to hardware via the API. So let's call a GET:

Here we can see that the name is nested within the owner field, so one would think we could simply query something like the following:

However, when trying this, we just get the same result as not having a query. I contacted support and it seems that it is not currently possible to filter/query nested elements/fields. I'm honestly surprised that this isn't possible and would really like to see this implemented. This allows for much more freedom and ease of use when using the API. I believe the best syntax would be a period (as shown in the last screenshot) or maybe a "/", as these are common symbols used in programming and operating systems for nested variables and directories.