Few names of the ancient masjids built by the native Arabs and Persians, there's no point naming all of masjids of Xamarweyne and Shingaani as none were built by reer samaale's, so I'll just name the oldest ones
Masjid Jaamacada
Masjid Fakhruddin (Haji Muhammad bin Abdullah bin Muhammad Ash-Shirazi)
Masjid Arbaca Ruskin (Khusrow Bin Muhammad Ash-Shirazi)
Masjid Ash-Shariif Ahmad
Masjid Al Marwaas
Masjid Al Xaaji Musa
Masjid Sheikh Rumaani
Masjid Abdulaziz Al Makhzuumi
Here Shariif Caydaruus lists the earliest tribes to settle in Muqdisho and who their modern day descendants would be for example, Shaanshi from Jidcati's, Gudmane from Al Afiifi, Reer Faqih from Banu Qahtaan, As for Al Aqabi then they relocated to Marka where they established Duruqba Neighbourhood where they still reside in till this day.
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This information is from manuscripts that were kept by Mucallim Mukarram from his ancestor Faqih Ahmad bin Faqih Abu Bakr Al Qahtani, here's the manuscript which was copied and also translated by Cerulli.
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Here, more tribes are named which mostly still reside in Muqdisho till this day ;
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As for gravesites, the two oldest of the existing graves are from Arab Muslims that passed away in early 2nd hijri century, before samaale even existed, their inscriptions are translated below, I wouldn't even need to list all the existing graves of Arabs and Persians from 7th and 8th hijri century as this is sufficient.
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Now it's upon you to show atleast one ancient structure left behind by so called ancient samaale's of Banaadir coast wether it's a masjid, gravesite or neighbourhood in ruins or even name one reer xamar clan that descend from samaale and lived in xamar during 12th hijri century.