Mindfulness of mind is the ability to hold the range of mind states in the field of mind so that dispassionate presence is realized. This ‘holding’ is not grasping any phenomenon as a real thing, more relating to it as a potential citta characteristic.
Dhammas are wave-like qualia rather than things. They are conditionally arisen. With dispassionate mindfulness they can subside. They need not define or belong to anyone.
In mindfulness, body teaches us what mindfulness is. When we steadily incline towards sensitive simplicity and getting comfortable – and absorb that, the result is samadhi.