How to work with BPF_MAP_TYPE_ARRAY_OF_MAPS?

[thediveo]

Say, we have...

struct FOO
{
    __u64 foo;
    __u64 bar;
};

struct {
    __uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
    __uint(max_entries, 8192);
    __type(key, __u32);
    __array(values, struct FOO);
} baz SEC(".maps");

...how do I correctly load and set up things on the Go side? I've tried to find examples, but had hits only on testdata and unfortunately can't see how to do it.

Are the inner maps automatically created for all entries of the outer map or do I need to allocate them myself?

Is there a way to resize the outer map at creation time?

Any help greatly appreciated!